AndrewJSchofield opened a new pull request, #23230:
URL: https://github.com/apache/kafka/pull/23230

   The `DescribeConsumerGroupTest.test...WithShortInitializationTimeout` tests 
are flaky. They have an inherent race condition, which generally works. 
However, they rely on admin client calls timing out before the consumer offsets 
topic has auto-created. Prior to this PR, the test cases internally iterated 
over the CONSUMER and CLASSIC group types, and tried to get both group 
protocols to fail with a timeout before the topic had initialized. Occasionally 
this race was lost and the test failed.
   
   I considered using a fresh cluster for each group type and running the tests 
twice. However, it seems that there's little benefit testing two group types, 
so I just changed the tests to use the CONSUMER group type only.


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